My 98 has a rattle that sounds like a plank falling on some other planks when I go over small bumps at low speed. It comes from the right rear mostly. Decent mechanic said it was my rear struts and replaced them at a cool $1500.00. Although the car now drives much better the rattle is still loud as ever. I'm aware it could be a hundred things so I'm looking for ideas to pass on to the Porsche guy. It's going back in tomorrow. Thanks!